5-2. Indoor unit
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General rules of drain piping
• Install the drain pipe with downward slope (1/100 or more) and so there are no rises in the pipe.
• Use general hard polyvinyl chloride pipe () and connect it with adhesive (polyvinyl chloride) so that
there is no leakage.
• Support the drain pipe with supports each 60 to 79 in (1.5 to 2.0 m).
• Do not install any air vents or traps.
• Always insulate the drain pipe to prevent condensation.
• When connecting the drain hose to the indoor unit, use the accessory band. (Except compact wall
mounted type and wall mounted type)
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Compact cassette type
11 in (300 mm)
or less
Max. 27 in
(700 mm)
Attached band
Drain hose
(accessory)
Downward gradient
1/100 or more
Horizontal
or upward
gradient
Ø3/4 (I.D.), Ø1-1/16 (O.D.)
(Locally purchased)
60 to 79 in
(1.5 m to 2.0 m)
Downward gradient
1/100 or more
Hanging fitting
Air bleeding
Rise
Trap
Ï
Ï
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Prohibited
• Drain lift-up pipe restrictions:
–
Lift-up height ≤ 27 in (700 mm) (from ceiling)
– Drain hose (pipe) length ≤ 11 in (300 mm) (between indoor unit and lift-up pipe)
• Water leakage may result from a failure to adhere to the restrictions above.
5-2. Indoor unit - (06-65) - 5. Drain connection
SYSTEM
DESIGN
SYSTEM
DESIGN
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